what is the composition of a star?what is it made of?

Answer 1

A star is a massive, compact body of plasma in outer space that is held together by its own gravity and, unlike a planet, is sufficiently massive to sustain nuclear fusion in a very dense, hot core region. This fusion of atomic nuclei generates the energy that is continuously radiated from the outer layers of the star during much of its life span.

Stars are formed within molecular clouds; large regions of high density in the interstellar medium (though still less dense than the inside of an earthly vacuum chamber). These clouds consist of mostly hydrogen with about 23-28% helium and a few percent heavier elements. One example of such a star-forming nebula is the Orion Nebula.
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Answer 2

A new star is pure hydrogen. The fusion process converts hydrogen into helium, and that accumulates as the star ages. Then, helium is fused into elements that are even heavier. An old star will have heavy elements up to iron in some quantity. Eventually, this causes instability, so the star explodes as a nova. If it is a really big one, it becomes a supernova. Finally, we have several possibilities, e.g. the remains of the nova or supernova become a neutron star or a black hole.

Answer 3

Mostly hydrogen and helium as others have mentioned. Since the stars convert hydrogen to helium to get energy the ratio of the hydrogen to helium is fixed. It will depned upon the age of the star. The 23 - 28% mentioned by someone applies to our own sun at this time. Billion years later the composition will be different. More helium and less hydrogen

Answer 4

First of all, hydrogen. But of the hydrogen is all used up for fusion, then it is made of heavier elements. An average star at the middle of its lifetime will be made about 50 % of hydrogen, another 30% of Helium, and the remaining 20% are all other elemsnts except for the very heavy ones in the periodic system. Those very heavy ones are only prduced by events as a nova or supernova, not by "standard" fusion.

Answer 5

A star is predominately hydrogen. Stars also contain helium, which is what practically all of the hydrogen is fused into: two hydrogen = one helium. Lastly, there are some other elements which are created by the process of continuous fusion, but it would be impossible to say which elements, and in what quantities they exist within the star.

Answer 6

A star is usually made up of hydrogen and helium

Answer 7

stars are composed primarily of hydrogen, with some helium and heavier trace elements that determine their metallicity.

Answer 8

Hydrogen.

Answer 9

star dust

Answer 10

hydrogen, helium and other trace elements